The coverage maps in the /2010, /2011, and /2012 directories show the coverage of the following series:

YYYY_MM_map.png is a coverage map for the series hmi.V_45s
YYYY_MM_map_m.png is a coverage map for the series hmi.M_45s
YYYY_MM_map_s720.png is a coverage map for the series hmi.S_720s
YYYY_MM_map_m720.png is a coverage map for the series hmi.M_720s

White spaces on the coverage maps indicate time where data is ready for use.
The colors on the coverage map indicate times where the data product is
not available or has some QUALITY bits set. Colors mean:

gold = iss loop open, an indicator that the instrument was not in normal data taking mode (labeled as 'no guiding')
blue = Data records have been processed but there is no useful observation for this time (labeled as 'missing').
pink = Data records are absent for this time, not observed or not yet processed (labeled as 'unknown').
green = times when QUALITY is anything but 0x00000000 (labeled as 'quality').

Note:
gold is overplotted on blue; as a result, times when data is missing may be hidden underneath times when the iss loop is open.

Note: green areas are nearly always fine, for instance the daily stripes at 0600 and 1800 hours are times when daily calibrations are
made (low line-of-sight velocity at SDO noon and midnight) and a pair dark and cal-mode filtergrams are made on each
camera. This means that 2 of the normal 12 Doppler camera and 2 of the normal 36 Vector camera filtergrams are
absent. Since several time steps on each side of the target time are used for interpolation this means that
2 of 72 filtergrams will be missing for 6 of the 45s time steps for the LOS products causing the vertical green bars
on the coverage maps. Since the 12-min products also use data from a larger window for averaging, the green bars
are wider for the 720s products. Data at these times have negligibly larger errors.

The coverage maps in the /fd10 directory show the coverage of the following series:

YYYY_MM_fd10_nrt.png is a coverage map for the series hmi.ME_720s_fd10_nrt
YYYY_MM_fd_fd10.png is a coverage map for the series hmi.ME_72s_fd10

The coverage maps in the /fd10 series are a montage of two maps: The left map shows coverage for hmi.S_720s and follows the color schemes outlined above. For the right map, colored spaces indicate times when inverted data is present; the color of the data correspond to the value of (INVNPROC) / ( PI*(RSUN_OBS*(1/CDELT1))^2 ), or (the number of inverted pixels)/(total number of pixels within the solar radius). Values greater than 1 are truncated to 1. The keywords RSUN_OBS and CDELT1 are obtained from the appropriate time in the hmi.S_720s data. White spaces indicate times where the stokes data are available but the inversion module has not yet been run.

The coverage maps in the /sharp directory show the coverage of the following series:

YYYY_MM_map___sharp.png is a coverage map for the series hmi.sharp_720s

Colors mean:

white = No data with 400000>NPIX>2000 exist in the series hmi.sharp_720s.
pink = Some, but not all, records with 400000>NPIX>2000 exist in the series hmi.sharp_720s.
blue = All records with 400000>NPIX>2000 exist in the series hmi.sharp_720s.